Hi Jeff,

Thought about it some over lunch, and I think that if you go the lvreduce/lvextend route, then you're likely to end up with a very messy, dead cat. What do you do if the disk you're backing up has multiple logical volumes defined on it? And if, the extents assigned to the lvol you want to backup weren't even contiguous? What would you do if the logical volume was built using extent-based mirrored striping, then you'd have to know the layout of each disk involved?

The only sane scenario I can think of where it would be OK to use lvreduce/lvextend would be where you know that the disk has only a single logical volume defined.